Offensive lineman, Ryan Lee, wears #69 for the Steelers. He is currently on the practice squad. Prior to Lee, Jamon Meredith wore #69 in 2011.
No, 69 is not a square number.
Hahaha 69...but Jared Allen is a notable. 69 can be an offensive lineman, including center, guard, or tackle. 69 can also be a defensive lineman, including tackles and ends. It isn't an eligible receiver number.
There are infinitely many of them and they are of the form 69*n where n is any counting number.
69 is a whole number, so there's no different whole number that's any closer to it.
The only notable player was Eugene Chung.